Lobster,
Close Plogo and then try it again.
I also have problems at times with the color not being sent correctly and sometimes a restart of the program works.

I just tried it with the font (thank you Joe Bass!) that your capture shows with a color picked from my desktop and it worked fine.
You can also use the colors example from gtkdialog.
Run it and then select a color from there for Plogo.

I am running Puppy Lupu 520 and that is what I used trying to determine if I could duplicate your session of using Plogo.

I will revisit plogo - look at it again and try to determine why the colour setting stuff sometimes bombs. I do not see anything in the code that would interfere with the setting routine, but I will look again. As for the saving of logos in other locations, it is possible, but, when conceiving plogo, I wanted images in one place along with the log file so that new pics could be recreated again with the same settings. I have made use of that facility. I imagine a copy button could be included (reducing the width of the existing buttons) that would launch a file dialog. I'll look into that as soon as I finish writing a streaming radio player that is now occupying much of my time.

Some fonts do not show up because of the way GTK and IM interpret font names. They are what I call funky TTFs. You can actually go in with fontforge and change the font name and then it should work. I discovered that font names containing punctuation chars always cause problems, and a lot of Win fonts contain punctuation symbols. There are also so-called "bad" fonts that have overlapping glyphs - also a problem, but that can also be fixed in fontforge.